Prep for being able to defer trace_block_bio_remap() until when the
bio is remapped and submitted by the DM target.
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
Signed-off-by: Mike Snitzer <snitzer@xxxxxxxxxx>
---
drivers/md/dm-core.h | 1 +
drivers/md/dm.c | 7 ++++---
2 files changed, 5 insertions(+), 3 deletions(-)
diff --git a/drivers/md/dm-core.h b/drivers/md/dm-core.h
index 72d18c3fbf1f..f40be01cca81 100644
--- a/drivers/md/dm-core.h
+++ b/drivers/md/dm-core.h
@@ -214,6 +214,7 @@ struct dm_target_io {
unsigned int target_bio_nr;
unsigned int *len_ptr;
bool inside_dm_io;
+ sector_t old_sector;
struct bio clone;
};
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 164cccf59297..2f2002348b26 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -567,6 +567,7 @@ static struct bio *alloc_tio(struct clone_info *ci, struct dm_target *ti,
tio->ti = ti;
tio->target_bio_nr = target_bio_nr;
tio->len_ptr = len;
+ tio->old_sector = 0;
return &tio->clone;
}
@@ -1120,7 +1121,6 @@ static void __map_bio(struct bio *clone)
{
struct dm_target_io *tio = clone_to_tio(clone);
int r;
- sector_t sector;
struct dm_io *io = tio->io;
struct dm_target *ti = tio->ti;
@@ -1132,7 +1132,7 @@ static void __map_bio(struct bio *clone)
* this io.
*/
dm_io_inc_pending(io);
- sector = clone->bi_iter.bi_sector;
+ tio->old_sector = clone->bi_iter.bi_sector;
if (unlikely(swap_bios_limit(ti, clone))) {
struct mapped_device *md = io->md;
@@ -1157,7 +1157,8 @@ static void __map_bio(struct bio *clone)
break;
case DM_MAPIO_REMAPPED:
/* the bio has been remapped so dispatch it */
- trace_block_bio_remap(clone, bio_dev(io->orig_bio), sector);
+ trace_block_bio_remap(clone, bio_dev(io->orig_bio),
+ tio->old_sector);
submit_bio_noacct(clone);
break;
case DM_MAPIO_KILL:
--
2.15.0
--
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